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docs/THIRD_PARTY.md

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+The original Prosody configuration loader in tests/reference/configmanager.lua
+is from commit cafd74b9c5ead46eb58910359eb266e1732b0aa1, supplied by the user.
+It is used for differential testing only. Its copyright notices are preserved;
+its MIT/X11 license is in tests/reference/COPYING.
+Rust runtime code is a new implementation. Dependency licenses remain with
+those dependencies; Cargo.lock records exact versions used.
+
+API references consulted:
+- https://docs.rs/mlua/0.12.2/mlua/struct.Lua.html
+- https://docs.rs/serde_yaml_ng/0.10.0/serde_yaml_ng/